#Yields of 20 consecutive batches of a chemical process.  
#The first 10 batches were run under a standard process and the
#second 10 under a modified process aimed at increasing mean
#yield.  Source: Box, Hunter, and Hunter, Statistics for
#Experimenters, Wiley, 1978.
89.7 81.4 84.5 84.8 87.3 79.7 85.1 81.7 83.7 84.5 84.7 86.1 83.2 91.9
86.3 79.3 82.6 89.1 83.7 88.5
